/*
 * Copyright 2010 - Jeremie Brebec
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.jb.user.server.impl;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import com.google.inject.Singleton;

@Singleton
public class SHAHashService implements HashService {

	/*
	 * (non-Javadoc)
	 * @see org.jb.user.server.impl.HashService#getHashedValue(java.lang.String)
	 */
	@Override
	public String getHashedValue(String text) {
		
		try {
			if (text == null || text.isEmpty())
				return "-";
			
			MessageDigest digest = MessageDigest.getInstance("SHA");
			digest.update( text.getBytes() );
			byte[] bytes = digest.digest();
			
			StringBuilder hexString = new StringBuilder();
			for (int i=0;i < bytes.length; i++) {
				hexString.append(Integer.toHexString((bytes[i] >>> 4) & 0x0F));
				hexString.append(Integer.toHexString(0x0F & bytes[i]));
			}
			
			return hexString.toString();	
			
		} catch (NoSuchAlgorithmException e) {
			return text;
		}
	}

}
